The U.S. created an Afghan air force that was too technologically advanced for its native country to sustain, then pulled the rug out from under it, according to a U.S. government inspector general report. A blistering, 148-page document by the Special Inspector General for Afghanistan Reconstruction (SIGAR) found that Afghan security forces were too heavily reliant on U.S. forces for airstrikes and on American maintenance contractors to keep Afghan aircraft flying.